Abstract
The production of electrolytic nickel includes the stage of leaching of captured firing nickel matte dust. The solutions formed during this process contain considerable amounts of Pb, which is difficult to extraction due to its low concentration upon the high-salt background. The sorption of lead from model solutions with various compositions by synthetic and natural titanosilicate sorbents (synthetic ivanyukite-Na-T (SIV), ivanyukite-Na-T, and AM-4) have been investigated. The maximal sorption capacity of Pb is up to 400 mg/g and was demonstrated by synthetic ivanyukite In solutions with the high content of Cl− (20 g/L), extraction was observed only with a high amount of Na (150 g/L). Molecular mechanisms and kinetics of lead incorporation into ivanyukite were studied by the combination of single-crystal and powder X-ray diffraction, microprobe analysis, and Raman spectroscopy. Incorporation of lead into natural ivanyukite-Na-T with the R3m symmetry by the substitution 2Na+ + 2O2− ↔ Pb2+ + □ + 2OH− leds to its transformation into the cubic P−43m Pb-exchanged form with the empirical formulae Pb1.26[Ti4O2.52(OH)1.48(SiO4)3]·3.32(H2O).
Highlights
Minerals of the ivanyukite group were discovered in 2009 by Yakovenchuk and coauthors in a pegmatite vein of the Koashva apatite mine, Khibiny Massif, Kola Peninsula, Russia [1]
We propose new conditions for the synthesis of the AM-4 and SIV
AM-4—is a synthetic analog of the mineral lintisite that is used in this work for comparison of its sorption properties with those of SIV was obtained according to the methodology described in detail in [3,18,19]
Summary
Minerals of the ivanyukite group were discovered in 2009 by Yakovenchuk and coauthors in a pegmatite vein of the Koashva apatite mine, Khibiny Massif, Kola Peninsula, Russia [1]. In contrast to othertitanosilicates discovered in the Khibiny Massif or Lovozero Massif (Kola Peninsula, Russia)—such as lintisite, zorite and sitinakite [2–7]—the synthetic of ivanyukite was was known prior to its mineralogical discovery, being obtained by D. Roe in 1990 [8] under the name name ‘grace titanium silicate’ (GTS). For their synthesis process, the authors had used Ti(OC2 H5 ) as a source of Ti. The synthetic titanosilicate AM-4 was first obtained by M.S. Dadachov in 1997 using TiCl3 as a starting reagent [9]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
